File Sync Links that may help... all the links I have, since I don't know the cause of your specific problem
-Size Limits https://forums.adobe.com/thread/1488242
-sync and email link http://forums.adobe.com/thread/1427516?tstart=0
-Phantom folder problem https://forums.adobe.com/thread/1490445
-an overview of assets https://assets.adobe.com/files
-File sharing https://forums.adobe.com/thread/1838790
Thank you, however, i cannot see a solution in these.
When I go to Get started with LR Mobile in top right of library module it asks for sign in, I click and get taken to sign window (even though I am signed in) I re-sign in, but it just ignores it.
Go back to start and it still asks for sign in.
Was working 10 days ago.